An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
You don't have to include it in your Works Cited page, unless you cite it on another slide. Underneath the picture, include the figure number. Capitalize the word figure. Use a . if you shorten the word, and use an Arabic numeral (don't spell out the number).